Window lock



Feb. 19, 19 35. c KOEHLER 1,992,033

WINDOW LOCK Filed Dec. 16, 1952 CH/I/FLES KOEHLER Patented Feb. 19, 1935 UNITED STATES PATENT OFFlCE 2 Claims.

My invention relates to that class of window locks which are used to lock a window in a partially open position. Locks of this type are commonly used between the two sashes of an ordinary I window, in order to afford a means whereby said Window may be locked in a partially open position to permit circulation of air in a room and ordinarily, the said window can be locked partially open either at the top or bottom.

It is a well known fact, however, that ordinary locks of this type can be manipulated by a person reaching thru the partially open window from the outside and operating the lock to unlock the window for complete opening.

By my invention, I provide a-lock which cannot be operated while the window is locked in a partially open position and one which cannot be unlocked until the window is completely closed, both at the top and bottom, thus making it impossible for anyone to unlock the same from the outside.

The object of my invention is to provide a lock of this type which can be easily attached to the sash of a window and by which the said window may be locked entirely closed or partially open either at the top or at the bottom.

A further object of my invention is to provide a lock which is durable, simple in construction and economical to produce.

One form of a lock embodying my invention and in the construction and use of which these objects may be attained is illustrated in the accompanying drawing in which:

Fig. 1 is a fragmentary view of a window showing my improved lock attached thereto. The

said window being in a closed position and the lock shown in the open position. 7

Fig. 2 is a similar view showing the window locked in a partially open position.

Fig. 3 is an enlarged plan view of a portion of a window in section on a line thru the lock and showing, in dotted lines, the position of the lock when used to look a window in its entirely closed position.

Fig. 4 is a view similar to Figure 3 but without the lock attached thereto.

' Fig. 5 is a front view of my improved lock.

Fig. 6 is a side view thereof.

As shown in the drawing the numeral 5 denotes a window frame of common construction having sash guide strips 6 and a window stop 7 mounted thereon.

The numeral 8 denotes the frame of the upper window sash and 9 the frame of the lower window sash. The numerals 10 and 11 denote the glass mounted in said sash frames as is commonly done.

My window lock consists of a base plate 12 to which is hinged a locking plate 13. The upper part of said locking plate is provided with a locking projection 14. Holes 15 are provided in the base plate 12 by means of which the said lock may be attached to the upper sash frame 8 with screws 16.

A stop plate 1'7 may be secured, if desired, to the lower sash frame in a position to engage the said lock and thus prevent any damage to the lower sash frame.

The said stop plate is extended, as at 18, in order to properly underlie the locking projection 14 in its position when the window is locked in the partially open position and said plate may be fastened to the sash frame by means of a screw 19.

As commonly constructed, the sash frames are provided with extensions 20 and 21 on each of the frames which overlap each other. These extensions terminate at the side of the sash frames and form a notch 22 between the said frames and the guide strip 6.

My improved lock is mounted in a position corresponding to the said notch 22 so that when the window is locked in a partially open position the locking plate 13 fits within the said notch 22, rendering it impossible for anyone to unlock the window from the outside by reaching thru the opening therein, since it becomes necessary to entirely close said window before it can be unlocked.

The lower bar 23 of the upper sash frame 8 extends beyond the front of the side bars 24 to one of which the lock is secured. When the window is to remain unlocked, the locking plate 13 is folded back against the base plate, as shown clearly in Figure 1, to permit uninterrupted movement of either sash frames. In this position, the lock will overlie the extending portion of the bar 23 so that it will not engage with the lower sash frame.

If it is desired to lock the window in an entirely closed position, the locking plate 13 is positioned as shown by dotted lines in Figure 3 to overlie the stop plate 1'7.

The said locking plate 13 is hinged to the base plate 12 in such a manner that there is a sufficient friction to maintain the said plate fixed in the position to which it is moved.

While I have described and illustrated one form of a lock which comprises my invention, I wish to have it understood, however, that the same may-be modified to a greater or lesser extent without departing from the scope of my invention.

I claim:

1. In combination with a pair of movable members mounted within a frame, one of said members having a notch therein providing a space between a portion of said member and said frame, an abutment surface adjacent to said notch, a lock of the character described comprising a locking plate hingedly secured'to the other of the movable members, said locking plate having a narrow portion and a wide portion, the narrow portion being adapted to be positioned to abut said abutting surface to prevent movement of said movable members, and to be positioned for sliding movement thru said space for permitting operation of the said wide portion to limit the movement of said movable members.

2. In combination with a pair of movable members mounted within a frame, a lock of the character described secured to the first of said members, a notch in the second of said members and at one side thereof, an abutment surface adjacent said notch, the said lock comprising an elongated hinge, one leaf of said hinge being secured to the said first movable member and the other leaf of said hinge being swingable thereon, a stop on said swingable leaf, the said swingabie leaf being adapted to be swung in position to abut the said abutting surface for meventing movement of said movable members, and to be swung in a position against the said frame for edgewise sliding movement within said notch, to cause the movement of said movable members to be limited by engagement between said abutting surface and said stop.

CHARLES KOEHLER. 

